Rear-dump stoker



Nov. 2 1926. 1,605,549

G. A. KOHOUT REAR DUMP STOKER i Filed Nov. 29, 1922 4 Sheets-Sheet 2 Nov. 2 W2@ REAR DUMP STOKER Filed Nov. 29, 1922 4 Sheets-Sheet 3 Nov. 2 1926. 1,605,549

G. A. Kol-muru REAR DUMP sToKER Filed Nov. 29. 1922 4 sheets-sheet 4 Patented Nov. 2, 1926.

Unirse Srarss GEORGE A. KOHOUT, OF CHICAGO, ILLINOIS.

REAR-DUMP STOKER.

Application led November 29, 1922.

My invention relates to stokers, and more particularly to the type of Stoker shown in my Patent No. 1,355,095, patented Oct. 5, 1920.

It is a purpose of the invention to provide a hopper feed Stoker operating on the general principles of the device shown in the above mentioned patent, that is, provided with members for accelerating the movement of the fuel from the hopper to the Stoker to deposit said fuel at the forward end of the Stoker from which the same is moved toward the rear or discharge end by the operation of a single lever as described in Said patent. The member for accelerating the movement of fuel is preferably in the form of a pusher member which is provided with a refractory body portion and an inner face of. refractory material.

It is a further purpose of the invention to provide a Stoker of the above mentioned character, or of any other type wherein the fuel moves from a receiving to a discharge end thereof, with an ash dumping means which is so constructed thatv the fuel will not be moved off the Stoker into the ash pit when the ashes are being dumped.

It is more specifically a purpose of the invention to provide a dumping section, or ash dumping member, which is provided with a member serving to act as a dam or partition to prevent the movement of the fuel off the end of the Stoker when said ash dumping member is moved. to dumping position.

It is still a further purpose of the invention to provide an ash dumping section of the character Set forth above with means for preventing the fuel from moving off thc'end of the st-oker when said ash dumping section is out of its normal horizontal position whether above or below the normal position.

It is another purpose of the invention to provide means for preventing` the movement of the Stoker bars out of their position with the top faces thereof in a plane when said ash dumping section is in dumping position. This is particularly important as a careless fireman may leave the Stoker with the points of the sections extending upwardly into the fuel while cleaning out clinkers, if this means is not provided, thus damaging the Stoker bars due to the heat of the fire burning off the points of the bars.

It is another purpose of the invention to provide a rear dumping section with clinker Serial No. 604,057.

removing means adapted to engage the rear wall of the furnace.

It is a further purpose of the invention to provide a dumping Section of the character set forth above on a fuel feeding device of any character whether the same be a Stoker or a chain grate.

It iS a further purpose of the invention to provi-de a Stoker of the character shown in the above mentioned patent with a coal receiving section or bar that is of greater width than the other Stoker bars making up the Stoker so as to give the coal received on Said receiving bar a greater throw than that given by the other sections of the Stoker, thus giving the fuel an initial acceleration aiding in moving the fuel along the same toward the discharge end thereof.

It has been found thatin providing the means for preventing the fuel from moving off the end of the Stoker the Same will also break up clinker-s, and it is a purpose of the invention to provide means for breaking up the clinkers associated with said dumping bar forwardly thereof. In providing a dumping section that can be moved upwardly above the horizontal position, the further advantage is obtained of knocking off and breaking up the clinkers at the bridge wall.

Other objects and advantages of the invention will appear as the description of the accompanying drawings proceeds. I-Iowever, I desire to have it distinctly understood that I do not intend to limit myself to the exact details shown or described, but that I intend to include as part of my invention all such obvious changes and modifications of parts as would occur to a person skilled in this art and as would fall within the Scope of the claims.

In the drawings: Y y

Fig. 1 is a view of a furnace partly in section showing the Stoker and the associated parts in Side elevation;

Iiig. 2 is an enlarged view partly in section and partly in elevation showing the rear ash dumping Section and associated parts in normal position;

Fig. 3 is a Similar view showing the same in ash dumping position;

Iig. i is a similar view showing the same in a raised position to clean clinkers o' the bridge wall;

Fig. 5 is a Somewhat diagrammatic view showing the dumping device applied to a chain grate;

Fig. 6 is a similar view showing the dumping device applied to a stoker sloping downwardly toward opposite sides of the furnace from the middle thereof;

Fig. 7 is a similar view showingl the dumping device applied to a stoker sloping toward the middle of the furnace;

Fig. 8 is a similar view showing the same applied to a stoker extending longitudinally of the furnace with the discharge at one end thereof and the fuel receiving end opposite thereto;

Fig. 9 is a View similar to Figs. 2, 3 and 4 of a slightly modified form of dumping secj tion; .i

Fig. 10 is an end view of one of the closure and pusher members at the fuel receiving opening;

Fig. 11 is a longitudinal section thereof;

Fig. 12 is a transverse sectional view of a slightly modified form of closure and pusher block; i

Fig. 13 is a longitudinal section thereof;

Fig. 14: is an inside end view of the pusher and closure member showing one application thereof;

Fig. A15 is a similar view of a different application thereof;

Fig. 16 is a similar view showing still another application thereof; and Fig. 17 is a fragmentary view similar to Fig. 3 of a modification.

Referring in detail to the drawings a furnace is shown in Fig. 1 having a bridge wall 2O and a front wall portion 21 between which the stoker 22 comprising the sections or stoker bars 23 is mounted. Said Stoker bars are made as shown in detail in my Patent No. 1,355,095 referred to above being connected together by means of the operating member 24 and being operated by means of the lever 25 through the link 26. rllhe first stoker bar 23', it will be seen from Fig. 1, is made of a much greater width across the top face thereof compared with the other stoker bars 23, but is lof the same general construction and operates in the same manner as the stoker bars 23 to throw the fuel toward the lower end of the stoker. rThis action takes place due to the construction of the bars set forth in detail in said patent which causes the same to have a throwing action causing the fuel to be thrown from one bar or section to the adjacent bar or section toward the rear of the furnace as the lever 25 is actuated. The fuel is placed in the hopper 27 and will feed downwardly toward the stoker by the action of gravity but as such feeding is not to be absolutely relied on, and as it is desirable sometimes to feed the fuel at a more rapid rate than would be done by gravity7 the pusher members 28 are provided, which are adapted to travel along the inclined surface 29 of the shelf-like portion at the forward end of the furnace up to the throat provided by the corner at 30 and the corner at 31 on the flat arch Vfhen the members 28 move to a position adjacent said edges 30 and 31 the same will close the fuel feeding opening, thus serving as air sealing and closure members for the fuel feeding opening when not in operation. at such times also cutting ofi' the fuel from the hopper and preventing the lire from burning lack into the same. The members 28 thus serve to accelerate the n'iovement of the fuel onto the stoker when actuated7 and can also be used for cutting off the air through the fuel receiving opening and for closing the opening at the bottom of the hopper to prevent entrance of fuel into the furnace when this is desired. The members 28 are actuated by means of the handle 33 mounted on the shaft 34s and connected by the llink mechanism 35 with the ears 3G on the member 28.

The member 28 is shown more in detail in Figs. 10 and. 11. Said member comprises a metallic shell having the side walls 3T. the top 38 and the bottom 39 and the outer wall 40. The top 38 extends rearwardly from the wall L10 and the ears 36 extend from said rearward extension of the top to the outer end wall 41-0. Said ears are shown as beingl perforated in Fig. 11 so that the links can be connected thereto.

1n the form shown in Figs. 1, 10 and 1l the member 28 is filled with plastic refractory material 11 which is molded within the metallic casing so as to provide a refractory block having an outer metallic cover e3:- cept on the face thereof toward the furnace or toward the inside of the lire box. llVhile refractory plastic material is shown in Figs. 1, 10 and 11. it will be evident that solid blocks of refractory material may be used as the material after being exposed to heat is substantially the same whether originally in plastic form or originally in the form of a solid block.

1n Figs. 12 and 13 a member 28 is shown having the ears 36 thereon within which the blocks l2 of refractory material are mounted, said blocks being held in place by means of the pins 43.

It will be seen upon reference to 1 11 and 13 that the'forward face of the block is inclined. this being due to the fact that the edge 30 and the edge 31 are not `in exact. vertical alignment. A. plurality of the members 28 or 28 is used for closing the opening in the front of the furnace through which the fuel is fed. and for moving the same along the shelf-like'portion onto the stoker.

1n Figs. 14;, 15 and 16 various ways of using said blocks are shown. 1n Fig. 1l the members 28 close the entire opening in the front of the furnace, except for the spaces occupied by the metallic frames 44 for the doors 45 through which the operator may reach to clean out the clinkers without removing the blocks 28. In Fig. l5 the blocks 28 are shown as extending all the distance from one of the side walls 46 to the other side wall 4G of the furnace. In Fig. 16 the blocks 28 are supplemented by the blocks 28 which are of similar oonstruction to the blocks 28 and are filled with refractory material 41, said blocks being adjacent the side walls 47 of the furnace and being removable to obtain access to the sides of the fire box for the same purpose that the doors 45 serve.

An ash dumping section is provided at the discharge end of the stoker, said ash dumping section being shown in Fig. 2 in its normal position prior to being dumped and comprising a dumping bar 48 pivoted at 49 on a fixed pivot mounted in any suit able manner in the setting of the furnace, said member 48 being provided with a depending ear 50 which has pivoted thereto at 5l the operating link 52, said link 52 being bent at an acute angle as shown at 58 at the end thereof that engages with the pivot 5l. The member 52 as shown in Fig. l extends to the front of the furnace and through the front wall thereof, and is provided with a handle 54 for operating the' same. In operation the handle 54 is pulled outwardly or pushed inwardly to move the dumping section to the desired position. It will be evident that the ash dumping section 48 will move downwardly as the link 52 is moved to the right in Fig. 2 and upwardly when said link is moved to the left in F 2. The member 48 is also provided with a perforated depending ear 55 to which the curved link 5G is pivoted at 57, said curved link being pivoted at the other end thereof to the ear 58 byme'ans of the pivot 59. The ear 58 depends from the retarding section which serves as a dam or stop for the fuel to prevent the same from moving off the Stoker and into the space left rearwardly of the member 60 when the ash dumping section is moved to 4dumping position, said coal retarding or retaining member 5() being mounted on a fixed pivot at 6I and is provided with an arcuate rear end face G2 so that the same will pass bythe section 48 as the section 48 is moved to the position shown in Fig. 8.

It will be evident from Fig. 8 that when the bar 52 is actuated to move the member 48 to the dumping position as shown in said figure, the section GO will be raised as shown in Fig. 8, this being due to the connection between said members 48 and 60, and the arrangement of the fixed and movable pivots thereof. It will be noted that the ear is longer than the ear 55 and that accordingly the distance from the pivot 49 to the pivot 57 is less than the distance from the pivot 81 to thepivot 59. lVhen the member is dropped from its normal position the member 55 swings to the right, thus carrying the lower end of the member 58 with it to the right due to the action of the link 56. As the distance between the pivots 57 and 59 is fixed and as the distance between the pivots 6l and 49 is fixed, and as the members 55 and 58 extend in a vertical direction when the parts are in the position shown in Fig. 2, it will be evident that the movement of the member 55 to the right in Fig. 8 will move the member 58 to the right, which movement will cause a swinging ofthe member 60 about its pivot in a counterlockwise direction thus raising the same to the position shown in Fig. 8. As the ear 58 is longer than the ear 55 the movement of the member 60 will be less than the movement of the member 48. The link 56 is curved primarily to avoid engagement with the forward edge portion 63 of the member 48 when it swings into its downward position as shown in Fig. 8. It is sometimes desirable to move the section 48 upwardly as shown in Fig. 4 above its normal position so as to break up clinkers,

as a mere downward movement would leave the clinkers fused together in a mass above the member 48, thus preventing cleaning of the fire as the clinkers would act as a support for Athe ash.

It is important that when the member 48 is raised, as well as when the same is lowered, that the coal does not move off the stok r into the ash p'it, as there is a space existing between the member 48 and the Stoker at such time. As the member 50 extends vertically and the member 58 also extends vertically, it will be evident that any substantial movement of the member 48 from a normal position will cause the pivot 5i' to move to one side or'the other of the line from the pivot 49 to the pivot 59, thus drawing the ear 58 by means of the pivot 5S toward the right and again swinging the member 60 in a counter-clockwise direction so as to act as a stop or retainer for the coal on the stoker. In operation the sections or stoker bars 28 move from the position shown in full lines in Figs. 8 and 4 to the position shown in F 2 alternate'- ly to move the coal from the receiving to the discharge end of the stoker, said bars eing mounted on pivots 64 and having links 65 connecting with the links 66 for operating said members simultaneously by means of the member 26.

It will be noted that the sections have sharp corners or points thereon at 6'4"', and that when the sections are in the position shown in Fig. 2, said points 67 will project up into the fuel bed. There will be a tendlll() all ency with the parts in such position for a considerable length of time for the points 67 to be damaged or burned off by the heat of .the fire. A fireman will often in moving the dumping section to dumping position attempt to remove clinkers from the rear of the stokeil with a bar and will leave the stoker bars in the position shown in Fig. 2, unless means is providedfor preventing such a motion of the Stoker bars when the dumping member is in dumping position.

It will be noted that the member 60 is provided with a concave portion 68 on the forward face thereof which is provided so that the lip G9 which may be provided at the rear of the section E23 will clear the same to allow the stoker to be properly actuated when the parts are in the position shown in Fig. 2. rEhere is, however7 a rounded projection 70 provided on said member GO which is at a greater distance from the pivot center of the member 60 than the concave surface (i8, which projection 70 will extend into the path of the end portion 69 of the member 23 when the member GO is in a raised position as shown in 3, or when the member i8 is in dumped posit-ion. The edge G9 will then engage with the projection 70 so as to prevent movement of the stoker bar 28, which being linked with the other bars through the members and 66, will prevent movement of any of such bars to such a position that the points 67 thereof could be damaged. it is, of course, possible to move the same very slightly as shown in dot-ted outline in Fig, 3 for a certain amount of play must be provided between the members 69 and 70, but this movement is so slight that the member 67 will not project into the bed of the fuel so as to be damaged by the heat therein.

`While the dumping section is shown as beingapplied to a stoker such as that shown in my patent referred to above in the views described, yet it is evident that the same can be applied to many other types of stokers or fuel feeding devices. in Fig. 5 a chain grate 7l is shown operating over the sprockets 7 2, the 'discharge end thereof being at the plate 7 3. The member G0 is connected with the dumping` section d8 in the same manner in this construction asin that previously described, and the same is operated by any suitable means attached to the ear 5r said members GO and 4-.8 being connected together by means of the link 56 connecting the ears 55 and 5S. in this form of the device a ccnvexly curved forward edge 74 is provided on the member G0 in order to allow the same to move without interference on the part of the member 7 3.

in Fig. G is shown a stoker that receives the fuel from a central fuel receiving` member 75, said stoker comprising the inclined members 7G, each of said members 76 leading to a discharge end, the discharge ends lying on the opposite sides of the device. A pair of dumping sections 4118 is provided in this instance, one for each of the meint rs and said members are provided with the retainer or stop members G0 connected thereto in the same manner as described in connection with Fig. 5.

In Fig. 7 a diderent application of the dun'iping means is shown in which the stokers 77 are inclined toward each other at their discharge ends and the dumping sections 48 are arranged side by side7 said sections being provided with the retainer or stop members 60 connected thereto in the same manner as described in connection with Fig. 5.

in Fig. 8 a Stoker 7 S inclined in only one direction is shown which is provided with the dumping section 48 and the stop or retainer member GO connected to the member 4S in the same manner as previously described. Quite often clinkers adhere to the bric ge wall, and if desired the 4dumping` section may be provided with means for removing the clinkers from the bridge wall. In Fig. 9 such a construction is shown, the bridge wall being indicated by the numeral 79 and the dumping section being designated by the numeral 807 said section being mounted on a fixed pivot 8l and having the portion 82 extending rearwardly of said pivot and having the convexly curved rear wall portion 83. Said section SO is provided with an ear S/l to which the links 52 and 55 are connected in a similar manner to that in which the links 52 and 55 are connected with the section 48. It will be seen that as the dumping section 8O moves to dumping position the rearward extension 82 thereof will engage with the face 85 of the bridge wall 7 9, thus scraping any clinkers that may have adhered thereto off the same. By reciprocating said section 8O practically all said elinkers will be broken up and will drop into the ash pit. it is, of course, to be understood that the section 8O is to be connected with a retainer or stop member similar to the section 6th by means of the links 55.

in Fig. 17 a slight modification of the last stoker bar is shown. Said stoker bar 23 is similar to the bar 23 and the member 60 is mounted in the same way as in Fig. 3 and operates in the same way except that the projection 70 does not prevent movement of the stoker bars as it is not engaged by the lip 69 when the bar 23 is rocked on the pivot Gil but passes by the sa me.

Having thus described my invention, what I desire to claim and secure by U. S. Letters Patent is:

l. In a furnace the combination with a device comprising a plurality of members for receiving fuel thereon and moving said fuel from one end to the other thereof. of an ash dumping member at the discharge end of lUO said device, and means for holding the fuel from movement off the end of said device when said ash dumping member is moved out of normal position in any direction.

2. fn a furnace the combination with a stoker comprising a plurality of members for receiving fuel thereon and moving said fuel from one end to the other thereof, of an ash dumping member at the discharge end of said stoker' movable both upwardly and downwardly from its normal position, and means operatively connected with said dumping member to move into position for holding the fuel from movement off the end of said stoker when said ash dumping member is moved out of normal position in either direction.

3. ln a furnace, the combination with a device comprising` a plurality of members for receiving fuel thereon and moving said fuel from one end to the other thereof, of an ash dumping member pivotally mounted at the discharge end thereof and swingable downwardly from normal closing position to ash dumping position, a fuel retaining member pivotally mounted between said dumping member and said device, and a link of fixed length pivoted directly to said members, the pivots of said link and said ash dumping member being normally in alignment, the pivot of said link to said fuel retaining member moving upwardly when the pivots of the link and the pivot of the dumping member are moved out of alignment to swing said fuel retaining member upwardly when said dumping member is swung downwardly.

l. The combination with a stoker comprising a plurality of stoker bars cooperating to move fuel from the receiving end to the discharge end thereof, of an ash dumping member normally in a position to close theV ash dumping opening` at said discharge end, and movable in opposite directions from said position, and a member operatively connected with said dumping member and interposed between said ash dumping member and said stoker for retaining the fuel on said stoker when said dumping member is out of normal position in either' direction.

5. In a furnace, the combination with a device comprising a plurality of members for receiving fuel thereon and moving said fuel from one end to the other thereof, of an ash dumping member pivotally mounted at the discharge end thereof and swingable downwardly from normal closing position tol ash dumping position, a fuel retaining member pivotally mounted between said dumping member and said device, a rigid depending ear on each of said members and a link of fixed length directly pivoted to said ears so las to swing said fuel retaining member upwardly when said dumping member is swung downwardly, one of said ears being longer than the other thereof to normally throw the pivots of the links in alignment with the pivot of the dumpingI member.

6. The combination with a stoker comprising a plurality of stokerA bars cooperating to move fuel from the receiving end to the discharge end thereof, of an ash dumping member normally having its upper surface flush with the upper surface of said stoker and movable above or below its normal position, a member interposed between said ash dumping member and said stoker normally fiush therewith and means connecting the same with said ash dumping member whereby7 said interposed member moves upwardly into fuel retaining position when said ash dumping member is moved out of its normal position in either direction. 7. The lcombination with a stokercomprising a plurality of stoker' bars cooperating to move fuel from the receiving end to the discharge end thereof, of an ash dumping member normally having its upper surface flush with the upper surface of said stoker, said ash dumping member being adapted to break up clinkers upon an upward movement thereof and to dump ashes upon a downward movement thereof, a member interposed between said ash dumping member and said stoker normally flush therewith and means connecting the same with said ash dumping member whereby said interposed member moves upwardly into fuel retaining position when said ash dumping member 'moves out of its normal position in either direction.

8. The combination with a stoker comprising a plurality of stoker bars cooperating to move fuel from the receiving end to the discharge end thereof, of an ash dumping member normally iny a position to close the ash dumping opening at said discharge end, and means engaging one 0f said bars to hold said stoker bars against movement when said dumping member is in dumping position.

9. The combination ,with a stoker comprising a plurality of stokerr bars cooperating to move fuel from the receiving end to the discharge end thereof, of an ash dumping member normally in a position to close the ash dumping opening at said discharge end, and means interposed between said dumping member and said stoker bars for holding said stoker bars against movement when said dumping member is moved to dumping position.

10. The combination with a stoker comprising a plurality of stoker bars connectedy together to move simultaneouslycooperating to move fuel from the receiving end to the discharge end thereof, of an ash dumping member normally in a position to close the ash dumping opening at said discharge end,

and a` member interposed between said ash dumpingmember and said stoker and connected with said dumping,` member so as to move to e position to retain the fuel on said stoker when said dumping` member is out of normal position, said interposed member having means thereon engaging the adjacent stoker bar to hold the same from movement out of normal position When said interposed member is in fuel retaining` position.

l1. The Combination with a stolzer comprising' a plurality of stoler bars each having; a thick and a thin edge, said bars normall)7 having` their upper surfaces aligned and being' linked together so as to move in unison, of an ash dumping` member and n fuel retainer member interposed between said dumpingl member and said stoler bers and .movable into and out of retaining` position upon movement of said dun'iping member out of or into normal position, seid retainer member hev'ing means there-on engaging the adjacent stoler bar to hold said bars from movement out of normal position When said dumping member is out of normal position.

l2. rllhe combination with a Stoker comprising a plurality of stoler bars each having` a thick and a thin edge, said bars normally having their upper surfaces aligned and being linked together so as to move in unison, of an ash dumping member and a fuel retainer member interposed between seid dumping member and said stolzer bars and movable into and out of retaining position upon movement of said dumping member out of or into normal position, said retainer member having means thereon engaging the adjacent stoker bar to prevent tilting` of said bars to a position with the thin edges thereof in the fuel bed, When said dumping member is out of normal position.

ln Witness whereof, I hereunto subscribe my name this 18th day of November A. D.,

GEORGE A. KOHOUT. 

